forked from Minki/linux
8f5b0c6398
Direct Xen to place the initial P->M table outside of the initial mapping, as otherwise the 1G (implementation) / 2G (theoretical) restriction on the size of the initial mapping limits the amount of memory a domain can be handed initially. As the initial P->M table is copied rather early during boot to domain private memory and it's initial virtual mapping is dropped, the easiest way to avoid virtual address conflicts with other addresses in the kernel is to use a user address area for the virtual address of the initial P->M table. This allows us to just throw away the page tables of the initial mapping after the copy without having to care about address invalidation. It should be noted that this patch won't enable a pv-domain to USE more than 512 GB of RAM. It just enables it to be started with a P->M table covering more memory. This is especially important for being able to boot a Dom0 on a system with more than 512 GB memory. Signed-off-by: Juergen Gross <jgross@suse.com> Based-on-patch-by: Jan Beulich <jbeulich@suse.com> Acked-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
126 lines
3.8 KiB
ArmAsm
126 lines
3.8 KiB
ArmAsm
/* Xen-specific pieces of head.S, intended to be included in the right
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place in head.S */
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#ifdef CONFIG_XEN
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#include <linux/elfnote.h>
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#include <linux/init.h>
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#include <asm/boot.h>
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#include <asm/asm.h>
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#include <asm/page_types.h>
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#include <xen/interface/elfnote.h>
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#include <xen/interface/features.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/xen-mca.h>
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#include <asm/xen/interface.h>
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#ifdef CONFIG_XEN_PVH
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#define PVH_FEATURES_STR "|writable_descriptor_tables|auto_translated_physmap|supervisor_mode_kernel"
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/* Note the lack of 'hvm_callback_vector'. Older hypervisor will
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* balk at this being part of XEN_ELFNOTE_FEATURES, so we put it in
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* XEN_ELFNOTE_SUPPORTED_FEATURES which older hypervisors will ignore.
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*/
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#define PVH_FEATURES ((1 << XENFEAT_writable_page_tables) | \
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(1 << XENFEAT_auto_translated_physmap) | \
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(1 << XENFEAT_supervisor_mode_kernel) | \
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(1 << XENFEAT_hvm_callback_vector))
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/* The XENFEAT_writable_page_tables is not stricly neccessary as we set that
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* up regardless whether this CONFIG option is enabled or not, but it
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* clarifies what the right flags need to be.
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*/
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#else
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#define PVH_FEATURES_STR ""
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#define PVH_FEATURES (0)
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#endif
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__INIT
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ENTRY(startup_xen)
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cld
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#ifdef CONFIG_X86_32
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mov %esi,xen_start_info
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mov $init_thread_union+THREAD_SIZE,%esp
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#else
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mov %rsi,xen_start_info
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mov $init_thread_union+THREAD_SIZE,%rsp
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#endif
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jmp xen_start_kernel
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__FINIT
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#ifdef CONFIG_XEN_PVH
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/*
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* xen_pvh_early_cpu_init() - early PVH VCPU initialization
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* @cpu: this cpu number (%rdi)
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* @entry: true if this is a secondary vcpu coming up on this entry
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* point, false if this is the boot CPU being initialized for
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* the first time (%rsi)
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*
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* Note: This is called as a function on the boot CPU, and is the entry point
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* on the secondary CPU.
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*/
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ENTRY(xen_pvh_early_cpu_init)
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mov %rsi, %r11
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/* Gather features to see if NX implemented. */
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mov $0x80000001, %eax
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cpuid
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mov %edx, %esi
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mov $MSR_EFER, %ecx
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rdmsr
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bts $_EFER_SCE, %eax
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bt $20, %esi
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jnc 1f /* No NX, skip setting it */
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bts $_EFER_NX, %eax
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1: wrmsr
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#ifdef CONFIG_SMP
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cmp $0, %r11b
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jne cpu_bringup_and_idle
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#endif
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ret
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#endif /* CONFIG_XEN_PVH */
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.pushsection .text
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.balign PAGE_SIZE
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ENTRY(hypercall_page)
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.skip PAGE_SIZE
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#define HYPERCALL(n) \
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.equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
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.type xen_hypercall_##n, @function; .size xen_hypercall_##n, 32
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#include <asm/xen-hypercalls.h>
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#undef HYPERCALL
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.popsection
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ELFNOTE(Xen, XEN_ELFNOTE_GUEST_OS, .asciz "linux")
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ELFNOTE(Xen, XEN_ELFNOTE_GUEST_VERSION, .asciz "2.6")
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ELFNOTE(Xen, XEN_ELFNOTE_XEN_VERSION, .asciz "xen-3.0")
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#ifdef CONFIG_X86_32
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ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __PAGE_OFFSET)
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#else
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ELFNOTE(Xen, XEN_ELFNOTE_VIRT_BASE, _ASM_PTR __START_KERNEL_map)
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/* Map the p2m table to a 512GB-aligned user address. */
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ELFNOTE(Xen, XEN_ELFNOTE_INIT_P2M, .quad PGDIR_SIZE)
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#endif
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ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
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ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
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ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .ascii "!writable_page_tables|pae_pgdir_above_4gb"; .asciz PVH_FEATURES_STR)
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ELFNOTE(Xen, XEN_ELFNOTE_SUPPORTED_FEATURES, .long (PVH_FEATURES) |
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(1 << XENFEAT_writable_page_tables) |
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(1 << XENFEAT_dom0))
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ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
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ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
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ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
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.quad _PAGE_PRESENT; .quad _PAGE_PRESENT)
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ELFNOTE(Xen, XEN_ELFNOTE_SUSPEND_CANCEL, .long 1)
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ELFNOTE(Xen, XEN_ELFNOTE_MOD_START_PFN, .long 1)
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ELFNOTE(Xen, XEN_ELFNOTE_HV_START_LOW, _ASM_PTR __HYPERVISOR_VIRT_START)
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ELFNOTE(Xen, XEN_ELFNOTE_PADDR_OFFSET, _ASM_PTR 0)
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#endif /*CONFIG_XEN */
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